Add following few lines into functions.php ( in your theme directory ), at the very bottom.

add_action( 'wp_enqueue_scripts', 'remove_woocommerce_when_not_needed', 99 );

function remove_woocommerce_when_not_needed() {
	remove_action( 'wp_head', array( $GLOBALS['woocommerce'], 'generator' ) );

	if ( function_exists( 'is_woocommerce' ) ) {

		if ( ! is_woocommerce() && ! is_cart() && ! is_checkout() ) {
			// dequeue styles
			wp_dequeue_style( 'woocommerce_frontend_styles' );
			wp_dequeue_style( 'woocommerce_fancybox_styles' );
			wp_dequeue_style( 'woocommerce_chosen_styles' );
			wp_dequeue_style( 'woocommerce-general' );
			wp_dequeue_style( 'woocommerce-layout' );
			wp_dequeue_style( 'woocommerce-smallscreen' );
			wp_dequeue_style( 'sv-wc-payment-gateway-payment-form' );

			// dequeue scripts
			wp_dequeue_script( 'wc_price_slider' );
			wp_dequeue_script( 'wc-single-product' );
			wp_dequeue_script( 'wc-add-to-cart' );
			wp_dequeue_script( 'wc-cart-fragments' );
			wp_dequeue_script( 'wc-checkout' );
			wp_dequeue_script( 'wc-add-to-cart-variation' );
			wp_dequeue_script( 'wc-single-product' );
			wp_dequeue_script( 'wc-cart' );
			wp_dequeue_script( 'wc-chosen' );
			wp_dequeue_script( 'woocommerce' );
			wp_dequeue_script( 'jquery-blockui' );
			wp_dequeue_script( 'jquery-placeholder' );
			wp_dequeue_script( 'fancybox' );
			wp_dequeue_script( 'jqueryui' );
			wp_dequeue_script( 'braintree-data' );
			wp_dequeue_script( 'braintree-js' );
			wp_dequeue_script( 'sv-wc-payment-gateway-payment-form');
		}
	}
}

Scripts checks if the page you are on actually needs woocommerce component ( e.g. product page, checkout page .. ) – if not, it will remove all scripts and styles related to Woocommerce and Braintree.

It’s also possible to disable woocommerce entirely on these pages through dedicated plugin – https://wordpress.org/plugins/plugin-organizer/

Also make sure you update maximum memory limit https://phpsolved.com/wordpress-adjust-maximum-memory-limit/